Model AMT Dewpoint Transmitter0 pages

Model AMT
Dewpoint Transmitter 4-20mA. Ranges available
between -1200C to +200C (-1840F to +680F) dewpoint
Model AMT Dewpoint Transmitter is a two wire 4-20mA loop powered transmitter,
used for continuous measurement of moisture in dry process gases or dry compressed
air, which will output a linear 4-20mA signal corresponding to the dewpoint
temperature. The Model AMT transmitter can also be factory congured to
output a 4-20mA linear signal for any other moisture unit e.g. ppm(v),
ppm(w), g/m3, lb/MMSCF etc.
ACTUAL
Fast Response - Stable - Reliable - Accurate SIZE*

Easy to Install.
The Ultra High Capacitance sensing element is long lasting and
oers excellent sensitivity, repeatability and response speed.
Each unit is supplied with a Certicate of Calibration,
traceable to International Humidity Standards, validating
accuracy better than ±20C dewpoint.

FEATURES
• 2 Wire Loop Powered Dewpoint Transmitter
• Overall Range: -1200C to +200C Dewpoint
• Accuracy better than ± 20C Dewpoint
• INTEGRATED AUTOMATIC CALIBRATION
• Can be congured for linear 4-20mA signal
in: 0C & 0F Dewpoint, ppm(v), ppb(v), g/m3,
lb/MMSCF

Measuring instrument
conforms with
EN 61326

* when printed at 100% on A4 format

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Temperature Compensation
Failure Diagnostics
Long Term Stability
Fast Response Time
IP66 / NEMA4X Protection

The transmitter also incorporates an Automatic Calibration (AUTOCAL) feature, which allows
the user to carry out a eld calibration / span check. The AUTOCAL feature is operated by
two small button switches built within the transmitter enclosure. To avoid tamper, the
switches are locked in normal use and can only be activated by following a specic routine
from the manual.
The integral RISC microprocessor circuitry of the Model AMT transmitter allows high resolution with
advanced self diagnostics for fault conditions. It also enables periodic re-calibration of the moisture
sensor, storing calibration data within the fully self contained unit. Loop powered by a 7V to 28V dc
source, the Model AMT transmitter will provide a linear 4-20mA signal over the chosen range.
The mechanics of the Model AMT transmitter have been designed to cope with extreme environmental
conditions. The rugged stainless steel construction oers protection to IP66 (NEMA4X), with the
transmitter electrical connections made via a secure industrial connector.
Model AMT transmitter can withstand 35,000 kPa (350bar) maximum pressure and by employing a low
resistance cable, the transmitter can be located at signicant distances, in excess of 1000 metres, from
the control room.
Designed with the operator in mind for reliable and accurate measurements, the Model AMT
transmitter is extremely easy to install and operate, requiring little or no maintenance.
The Model AMT transmitter is supplied with a Certicate of Calibration, an instruction manual and 2m
connecting cable.
Note: The Model AMT is not suitable for Ammonia (NH3), Chlorine (CI) and Hydrogen Chloride (HCI).
SF6 can be monitored with no eect to the sensor element.
Sulphur Dioxide (SO2) can be monitored if the moisture content is low, less than 100ppm(v).
© Alpha Moisture Systems Ltd.

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